Is there an evidence that black oxide thickness is well controlled?

是否能证明黑化厚度有很好的管控？

youdao

If you cool it too quickly, the black oxide will stay stuck to the copper.

如果你冷却太快，黑色氧化物将继续坚持铜。

youdao

If you cool it too quickly, the black oxide will stay stuck to the copper.

如果你冷却太快，黑色氧化物将继续坚持铜。

youdao